code: def test_document_store_class_with_extra_fields():
      MyStore = document_store_class(
          "MyStore", extra_fields={"my_field": 10}
      )
      store = MyStore()
      assert store.my_field == 10
  
file_path: haystack/test/testing/test_factory.py
imports: import pytest
  from haystack.dataclasses import Document
  from haystack.testing.factory import document_store_class, component_class
  from haystack.core.component import component
label_desc: Use image node_id 7 for calling a global function with example usage: test_document_store_class_with_extra_fields() without return types